Nexgen Mediatech Inc.
NO
VER. A1
TITLE
Level 1 Service Manual
PAGE
8/30
5. Defect mode, Possible causes and Solution for End-Users
Defect Mode
Possible causes
Solution
1.No picture
1.Did you connect power supply core?
2.Did you turn on the power?
3.Is the signal line connected correctly?
4.Is the screen in power saving mode?
1.Is the screen in power saving mode?
2.Turn on power supply.
3.Connect the signal line correctly.
4.Press any key of computer.
2.Abnormal colors
1.Is the signal line connected correctly?
1.Connect the signal line correctly.
3.Expanded picture
1.Is the signal line connected correctly?
2.Is the input signal outside the man-
datory frequency range?
1.Connect the signal line correctly.
2.Enter signals in the mandatory
frequency range.
4.Picture is too dark
1.Are the brightness and contrast
minimum?
1.Adjust brightness and contrast.
5. Image too small or big 1. Need to adjust vertical control?
2. Need to adjust horizontal control?
1. Adjust to the wanted vertical size.
2. Adjust to the wanted Horizontal size.
6.Only sound, no picture
1.Has the direction of input source
changed?
2.Is input source connected correctly?
1.Check the accuracy of the input source.
2.Check if circuits are connected
correctly.
7.Only picture, no sound.
Is volume adjusted to
minimum?
1.Is there any problem with input source?
2.To adjust the volume in properly.
3.Is sound line not connected?
1.Check the accuracy of the input source.
2.Adjust the volume to the proper level.
3.Connect sound line correctly.
8.Cannot use remote
control
1.Check if batteries are working?
2.Is there any disturbance from static and
thunder??
1.Replace the batteries.
2.Turn off the power for 10 seconds; and
then turn it on again.
9.No TV picture or picture
is unclear
1. Cable is disconnected or connected not
very well
2. Channel is not stable
1. Connect cable line correctly
2. Fine tune the channel frequency
10.
Cannot receive
specified channels
1. Never did Auto Scan
2. The channel was cancelled
3. The signal is too weak
3. Redo auto scan/Add the
channel/Fine tune the channel
frequency/Confirm the channel
exists/Confirm the antenna is
full channel(UHF/VHF)
4. Same as above
5. Same as above
11.
No colors.
1.Is the hue/tint minimum?
1.
Adjust the color setup in the Menu
12.
Dotted lines or strips
1. The antenna is disturbed or is set on
wrong direction
2. The signal is amplified too high.
3. The signal is too weak.
1.
Adjust or move antenna.
2. Reduce the amplification rate.
3. Install the amplifier
13.
Overlapped images or
ghost buildings)
1.The antenna is disturbed or is set on
wrong direction
1. Change input source to RF cable./
Change the antenna location.
8
